code: def construct_dgl_client_env_vars(
      num_samplers: int,
      tot_num_clients: int,
      part_config: str,
      ip_config: str,
      num_servers: int,
      graph_format: str,
      num_omp_threads: int,
      group_id: int,
      pythonpath: Optional[str] = "",
  ) -> str:
      """Constructs the DGL client-specific env vars string that are required for DGL code to behave in the correct
      client role.
      Convenience function.
  
      Args:
          num_samplers:
          tot_num_clients:
          part_config: Partition config.
              Relative path to workspace.
          ip_config: IP config file containing IP addresses of cluster hosts.
              Relative path to workspace.
          num_servers:
          graph_format:
          num_omp_threads:
          group_id:
              Used in client processes to indicate which group it belongs to.
          pythonpath: Optional. If given, this will pass this as PYTHONPATH.
  
      Returns:
          client_env_vars: The client-specific env-vars in a string format, friendly for CLI execution.
  
      """
      client_env_vars_template = (
          "DGL_DIST_MODE={DGL_DIST_MODE} "
          "DGL_ROLE={DGL_ROLE} "
          "DGL_NUM_SAMPLER={DGL_NUM_SAMPLER} "
          "DGL_NUM_CLIENT={DGL_NUM_CLIENT} "
          "DGL_CONF_PATH={DGL_CONF_PATH} "
          "DGL_IP_CONFIG={DGL_IP_CONFIG} "
          "DGL_NUM_SERVER={DGL_NUM_SERVER} "
          "DGL_GRAPH_FORMAT={DGL_GRAPH_FORMAT} "
          "OMP_NUM_THREADS={OMP_NUM_THREADS} "
          "DGL_GROUP_ID={DGL_GROUP_ID} "
          "{suffix_optional_envvars}"
      )
      # append optional additional env-vars
      suffix_optional_envvars = ""
      if pythonpath:
          suffix_optional_envvars += f"PYTHONPATH={pythonpath} "
      return client_env_vars_template.format(
          DGL_DIST_MODE="distributed",
          DGL_ROLE="client",
          DGL_NUM_SAMPLER=num_samplers,
          DGL_NUM_CLIENT=tot_num_clients,
          DGL_CONF_PATH=part_config,
          DGL_IP_CONFIG=ip_config,
          DGL_NUM_SERVER=num_servers,
          DGL_GRAPH_FORMAT=graph_format,
          OMP_NUM_THREADS=num_omp_threads,
          DGL_GROUP_ID=group_id,
          suffix_optional_envvars=suffix_optional_envvars,
      )
  
imports: import argparse
  import json
  import logging
  import multiprocessing
  import os
  import queue
  import re
  import signal
  import subprocess
  import sys
  import time
  from functools import partial
  from threading import Thread
  from typing import Optional
label_desc: Use image node_id 10 for calling a global function with example usage: construct_dgl_client_env_vars(num_samplers, tot_num_clients, part_config, ip_config, num_servers, graph_format, num_omp_threads, group_id, pythonpath) and returns: client_env_vars_template